Central Electronic Module on 2004 Volvo XC70

This has happened 1 time so far. Volvo can't find anything wrong with car. Diagnostics showed error codes for everything but yet once they unhooked car from machine it started right up and is running fine again. Air bag code and orange warning light were cleared but after 3 weeks they are back on again I was driving on street 35mph. Car suddenly 'bucked', a 'thunk'sound came from it, then all power, electronics and engline died. Car was dead. I rolled into hard shoulder. No electrical power in car at all. After a few seconds i tried to start car, No power. Left car 5 mins, then car started, we went back on road, made it home turned car off waited 1 hour tried to start it and it would not start but had power back. The Air bag code came on. and Orange Engine light came on. Volvo cleared all the codes, said car ran fine. to stop the engine. Volvo told me I may have to replace the CEM. (central Electronic module) if the engline dies again, but that is very expensive $1200.00. Research on the web shows that many people with this make and model for 2004 are having the same issues

by in Kansas City, MO on April 15, 2010
3 answers 2 comments
ANSWER by on May 06, 2010
This is so infrequent that it will be very difficult for a shop to address. Has this happened since you first wrote this question a few weeks ago?
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COMMENT by on September 07, 2010
Yes two more times, last time just 3 days ago.
ANSWER by on June 25, 2010
Yeah,well the same thing just happened to me. And the volvo dealer also said to replace this module(CEM),so i was also looking for an answer.And this is very expensive. Great i wish I saw this last week before I purchased the car.
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ANSWER by on August 16, 2010
I have a 2004 S80. It is in the shop for exactly the same reason.
COMMENT by on October 21, 2010
so what did they repair?
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..., or the immobilizor, or engine switch perhaps? Volvo told me I may have to replace the CEM. (central Electronic module) if the engline dies again, but that is very expensive. Any thoughts on what the problem is??...